Warm-up. Agenda Mini-quiz (1-1, 1-2) Homework Review Enrichment 1-3 Section 1-4 Homework Hand in...
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Transcript of Warm-up. Agenda Mini-quiz (1-1, 1-2) Homework Review Enrichment 1-3 Section 1-4 Homework Hand in...
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Warm-up
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Agenda
Mini-quiz (1-1, 1-2) Homework Review Enrichment 1-3 Section 1-4 Homework
Hand in Definitions
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Quiz Time
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Quiz 1-1, 1-2
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Definitions
A line is one of the basic undefined terms in Geometry. Lines have one dimension – length. They consist of an infinite number of points placed side by side. They are named using lower case script letters or by naming two points on the line with a double arrow above them.
Example
l or AB)************* *
A
B
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Study Guide 1-3
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Practice 1-3
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Practice 1-3
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Practice 1-3
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Enrichment 1-3
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Caution – Answers Ahead
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1-3 Enrichment
20 in 45 in
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1-3 Enrichment
6 ft
3 ft5 ft
9 ft
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Section 1-4 Measuring Segments
AB
C
l
A, B, and C are collinear.
B is between A and C.
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Basic Concepts
Postulate – statement that is assumed to be true
Number Line d
d = |-5 – 10|What is the distance from B to E ?
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Postulate 1-1Ruler Postulate
Ruler Postulate – The points on any line can be paired with real numbers so that, given any two points P and Q on the line, P corresponds to zero, and Q corresponds to a positive number. P Q
What this really means – you can always measure the distance between two points and that distance will always be a positive number.
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Postulate 1-2Segment Addition Postulate
Segment Addition Postulate – If Q is between P and R, then PQ + QR = PR. If PQ + QR = PR, then Q is between P and R.
P Q R
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Example
N L M
Find LM if L is between N and M, NL = 6x – 5, LM = 2x + 3 and NM = 30.
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a2 + b2 = c2
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Example
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Pythagorean Triplets
3 4 5
5 12 13
7 24 25
9 40 41
11 60 61
13 84 85
15 112 113
17 144 145
19 180 181
21 220 221
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BC Times
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Distance Formula
Used to measure the distance between two points on a coordinate plane.
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Example
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Recap
H G I
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Recap
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Recap
L M N
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Recap
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Caution – Answers Ahead
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Study Guide 1-4
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Study Guide 1-4
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Homework
SG & P Section 1-4 Enrichment 1-1